The pair turned on the driver after he confronted them about touching on their Myki cards. Photo: Supplied

The male passenger returned to the front of the bus at 9.41 am, and once again became verbally abusive while also blocking the driver's view.

He was soon joined by the female passenger, and the pair began pushing the driver while he was still driving.

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After the driver stopped the bus and demanded the pair get off, they refused, and continued to verbally abuse him before the male passenger stuck his hand in the driver's face.

A few minutes later, the man and woman decided to exit, but not before the woman turned around the spat on the driver. Her companion jumped back on the bus, swore at the driver, made threats to harm him and stuck his finger in the driver's face.

The man is described in his 40s, of Caucasian appearance with blond hair, and was wearing a black hooded jacket. The woman, also in her 40s, was blonde and of Caucasian appearance, wearing a black jacket with a fur-trimmed hood, black jeans, gloves and carrying a black backpack at the time of the offence.